Tutorial - How do we multiply complex numbers ex 13, (8 + i)(7 + 2i)

The video tutorial introduces the box method for multiplying binomials and trinomials, likening the process to calculating the area of a rectangle. The instructor demonstrates setting up a box divided into quadrants, placing terms along the top and side, and multiplying to find the area of each box. The tutorial covers simplifying and combining like terms, particularly focusing on complex numbers, and concludes with writing the final answer in the form of A + BI.

What is the primary concept behind the box method for multiplying binomials?

• It simplifies using quadratic formulas.

• It relies on factoring.

• It represents products as areas.

• It uses the distributive property.

When setting up the box for binomial multiplication, how many quadrants are created?

• Six

• Three

• Four

• Two

In the example given, what is the result of multiplying 7 by i?

• 14i

• i

• 7i

• 7

What is the combined result of 16i and 7i?

• 23i

• 16i

• 9i

• 7i

How is the expression 2i^2 simplified in the final answer?

• As 2

• As -2

• As 4

• As 0